html,body,#app{
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

@mixin px($px){
  font-size: ($px)*1px;
  [data-dpr = "2"] & {
    font-size: ($px*2)*1px;
  }
  [data-dpr = "3"] & {
    font-size: ($px*3)*1px;
  }
}
